NAR sanctioned competition
is governed by the United States Model Rocket Sporting Code. The USMRSC is
commonly known as the Pink Book because it was originally printed with a pink
cover. The current Pink Book is available on line: US Model Rocket Sporting Code. NAR
members can request a copy from NAR HQ.

Background

NAR sanctioned competition
is my favorite model rocket activity. I started flying model rockets in the
winter of 1965 and attended my first NAR event in Houston in the summer of
1970. I had just graduated from Thrall High School and would soon be attending
college in Sherman, Texas. I placed first in both D Egg Loft Altitude and Drag
Efficiency in my Division. The ‘Red Baron’ shot down my glider! Even if I had
not placed, I knew this was a hobby that would hold my interest for a lifetime.
I was hooked!

Overseas tours of duty with
the US Army (Pershing missile) caused a break in my participation in NAR
competition. I resumed in 1997 along with my then 12-year-old son, Danny. I
found that many things had changed. Micro Motors, composite fuel B, C and D
motors and changes in the US Model Rocket Sporting Code combined to make much
of my experience and strategy obsolete. There are constants in any activity,
though, and it is the constants of NAR sanctioned competition that I want to
discuss here. These constants can be thought of as your competition strategy.

Competition Strategy: The
Constants of Competitive Model Rocketry

Constant 1: Have FUN!
The most important thing to remember about NAR competition is that model
rocketry should be FUN! Any activity that you choose for a hobby should be more
relaxing and entertaining than frustrating. If you are not having fun, then
stop; take a few deep breaths and remind yourself that this is JUST A HOBBY!
Anytime you have a question or concern, ask a fellow rocketeer. A model rocket
contest is not a contentious affair. You'll find that the people with whom you
are competing will bend over backwards to help you, often at the expense of
losing! They will freely share their 'secrets' and I have often seen them swap
supplies or donate items that might be used to beat them.

Constant 2: Know the RulesObviously, being prepared and organized will help you in flying in
a model rocket contest. Building and practicing with properly designed models
is a good first step. The only way to do this is to know the rules. US Model Rocket Sporting Code. Read the
entire USMRSC. There are sections that modify other sections. You must
understand the entire Code. Each event has its own set of special requirements concerning
such things as construction, catching the model, and number of allowed or
required flights. Feel free to ask questions. Contact other rocketeers, your
local NAR Section, or NAR HQ.

To help new competitors
learn the ropes, The Competition Consortium as created the TCC Pink
Book Lite and the TCC
Competition Primer. The Pink Book Lite is the USMRSC stripped down to only
the rules that govern flying the events. The TCC Competition Primer is an
online compilation of general and specific NAR competition information, with
links, for novice competitors and BTCs (Big Time Competitors).

Constant 3: Be Prepared
’Be Prepared’ is not just the Boy Scout motto. It is a necessity
for model rocket competition. You want to make sure you have all the parts,
equipment and supplies you need. This will depend on the events you enter.
Regardless of the events you enter, however, your preparation will be governed
by what I call the Four Rs.

* Reliability: There
are no points for disqualified flights. Enter rockets that you have flown
successfully before. For many events you’ll be able find a commercial kit that
is suitable. Make sure the recovery system will function properly and that the
motor will stay where it is supposed to. Flying unproven designs at a contest
is asking for trouble. High tech, cutting edge designs are often beaten by more
reliable models of lower performance that function as designed. If you choose
to follow the ‘Take No Prisoners’ path, plan ahead and make time for practice
flights to prove your models.

* Return: Be certain
you understand the rules of each event you enter. Some events require that each
flight be returned. Some require that one flight be returned. Some have no
return requirement. You must recover the model in order to set a national record.
Be prepared to recover your models. Wear appropriate clothing, bring FRS
radios, arrange for a ‘ground crew’ to help, make sure that you have a good
view of the model when it reaches the ground. Take drinking water with you,
especially if the climate is hot and dry.

* Redundancy: Try to
have more than one rocket for each event you enter. If the flying field is
small or the weather is less than optimal, you may need to use models that
don't perform as well as your best birds. Be prepared with models and motors
that offer low and high performance options. Come prepared with different sizes
of parachutes and streamers.

* Repetition: Most
events allow two flights. Many events sum the performance of both flights to
determine scoring. Understand the scoring and be prepared to make repeat
flights. Be sure you have enough motors, models and other supplies of the right
type and allow time for multiple flights.

Competition Tactics: Design,
Build, Fly

Competition tactics involves
exactly how you design, build, and fly your models. In general, you should try
to achieve the highest possible performance while still meeting the event
requirements. This means your rockets should go as high as possible and still
deploy the parachute, streamer, glider, rotors, etc. Gliders should go as high
as possible, but that have to survive boost and then transition to glide.
Helicopter models should go as high as possible but have to deploy their rotors
and auto rotate. Egg Lofters should go as high as possible but must return the egg
unbroken. Here are some tactics to consider:

·The biggest factors in altitude performance that you can control
are weight, body diameter (frontal area) and good construction. You'll do
better in almost all USMRSC events by minimizing weight and frontal area while
ensuring that the fins are on straight and have a uniform airfoil.

· You
can further reduce aerodynamic drag by using only three fins and launching from
a tower or piston launcher instead of using a rod.

·Your model will have less drag with a good finish than with a poor
one. Using too much paint adds weight that could offset the effect of the
smooth finish.

· For
duration events, use a minimum diameter body tube and the largest/most
efficient recovery system that will reliably deploy properly. Sometimes this
will mean using the smallest possible motor and body tube diameter to get the
most altitude. Egg Loft duration, however, already requires a large body
diameter. One caveat here – younger competitors can more easily pack parachutes
and streamers into larger-than-minimum body tubes.

·For altitude events, using minimum diameter and weight will
usually achieve the highest altitude. Use a program such as wRASP or RocSim to verify your
choice of delay time and launch weight. While the optimum weight for most model
rockets is the weight of the motor, in some rare cases you will have to add
weight to get the most altitude. Usually you'll use a small recovery system in
order to minimize duration and make recovery easier. Remember that the model
must be TRACKED to place. If it is too small or not visible enough you will
have problems.

·
Fly the weather and fly the field. If it’s windy, if the field is small or has
hazards, consider using a smaller recovery system or lower performance rocket
or glider.

In
the long run, you will probably garner more points by consistently placing
(earning 1st, 2nd, 3rd or 4th) than
by making an all out, ‘Take No Prisoners’, maximum performance effort. However,
after you’ve gained some experience in competition, you may want to push the
envelope. You can experiment with various combinations of altitude and hang
time for duration events. Consider using a piston launcher or other exotic
launchers. Build more than one model for each event in the contest. Use a
go-for-broke, take no prisoners, maximum performance bird for your first
flight. Use a reliable, sure-fire, positive return model to get a qualified
flight on your second flight, if return is required. Always have backups. Bring
different sizes of parachutes and streamers. Build different sizes of gliders.
Exotic building techniques offer many advantages and challenges. Try rolling
your own body tubes from vellum or fiberglass. Streamline your models to have
the smallest possible base diameter, thus reducing base drag. You have to
decide how much time, money and effort you can expend. Most of all, you have to
remember to HAVE FUN!